If I remember correctly, German author Karl Brandler Bracht, in his book "How to develop your occult powers", mentions that in the East they consider both planetary hours, and also "Elemental hours", if you will. Meaning every Tattva (element), Akasha, Vayu (Air), Tejas (Fire), Apas (Water), Prithvi (Earth), is more powerful in specific times of the day, exactly like the planets. This knowledge, he says, is crucial not only for beginnings, starting projects etc. but also for magickal workings. For example with Magick of Fire, Pyrokinesis etc. doing it during the Tejas time would make it much more powerful.
He says that the element that was dominant when you were born will have an influence on you. He also says that starting projects during the Akasha and Vayu time is not good at all, while the Prithvi time is very favorable for blessings and white magick in general. For more info try to get the book if you can.
The timing works like this. At sunrise a cycle starts. Then for 24 minutes Akasha will be dominant, then Vayu for 24 minutes, then Tejas and so on in the order I listed above. A cycle lasts 2 hours in total and then it re-starts. Inside of the 24 minutes, there is another mini cycle. For 4 minutes and 48 seconds each Tattva is more active. So if it's Tejas that is dominant it would be Tejas-Akasha, Tejas-Vayu, Tejas-Tejas (extremely powerful for fire Magick), and so on.
I use this knowledge now, I don't know how accurate it is yet, I'm still experimenting with it. I took this opportunity to share it with you guys, I already wanted to anyway. If you want, you can experiment with it too and tell me your experience.